ISL78227 Datasheet, PDF (1/43 Pages) Intersil Corporation – 2-Phase Boost Controller with Integrated Drivers

DATASHEET
2-Phase Boost Controller with Integrated Drivers
ISL78227
The ISL78227 is an automotive grade (AEC-Q100 Grade 1),
2-phase 55V synchronous boost controller intended to simplify
the design of high power boost applications. It integrates
strong half-bridge drivers, an analog/digital tracking input and
comprehensive protection functions.
The ISL78227 enables a simple, modular design for systems
requiring power and thermal scalability. It offers peak-current
mode control for fast line response and simple compensation.
Its synchronous 2-phase architecture enables it to support
higher current while reducing the size of input and output
capacitors. The integrated drivers feature programmable
adaptive dead time control offering flexibility in power stage
design. ISL78227 offers a 90°output clock and supports 1-,
2- and 4-phases.
The ISL78227 offers a highly robust solution for the most
demanding environments. Its unique soft-start control
prevents large negative current even in extreme cases, such as
a restart under high output prebias on high volume
capacitances. It also offers two levels of cycle-by-cycle
overcurrent protection, average current limiting, input OVP,
output UVP/OVP and internal OTP. In the event of a fault, the
fault protection response can be selected to be latch-off or
hiccup recovery.
Also integrated are several functions that ease system design.
A unique tracking input is available that can control the output
voltage, allowing it to track either a digital duty cycle (PWM)
signal or an analog reference. The ISL78227 provides input
average current limiting so the system can deliver transient
bursts of high load current while limiting the average current to
avoid overheating.
Features
• Input/output voltage range: 5V to 55V, withstands 60V
transients
• Supports synchronous or standard boost topology
• Peak current mode control with adjustable slope
compensation
• Secondary average current control loop
• Integrated 5V 2A sourcing/3A sinking N-channel MOSFET
drivers
• Switching frequency: 50kHz to 1.1MHz per phase
• External synchronization
• Programmable minimum duty cycle
• Programmable adaptive dead time control
• Optional diode emulation and phase dropping
• PWM and analog track function
• Forced PWM operation with negative current limiting and
protection
• Comprehensive fault protections
• Selectable hiccup or latch-off fault response
• AEC-Q100 qualified, Grade 1: -40°C to +125°C
• 5mmx5mm 32 Ld WFQFN (Wettable Flank QFN) package
Applications
• Automotive power system (e.g., 12V to 24V, 12V to 48V, etc.)
- Trunk audio amplifier
- Start-stop system
- Automotive boost applications
• Industrial and telecommunication power supplies
PVCC
VIN
EN_IC
POWER-GOOD
CLOCK_OUT
PVCC
PGND
VIN
BOOT1
UG1
PH1
LG1
EN
PGOOD
ISEN1N
ISEN1P
ISL78227
BOOT2
TRACK
CLKOUT
SS
COMP
UG2
PH2
LG2
ISEN2N
ISEN2P
FB
PVCC
RSEN1
VOUT
VIN
RSEN2
FIGURE 1. SIMPLIFIED APPLICATION SCHEMATIC, 2-PHASE
SYNCHRONOUS BOOST
100
95
90
VO = 18V
85
80
VO = 24V
75
70
VO = 36V
65
60
55
50
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
LOAD CURRENT (A)
NOTE: (See Typical Application in Figure 4 on page 8.)
FIGURE 2. EFFICIENCY CURVES, V_IN = 12V, T_A = +25°C
February 24, 2016
1
FN8808.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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